Valve grinding and reseating tool



W. B. MARTIN. VALVE GRINDING AND RESEATING TOOL. APPLICATION FILED JUNE 3. 1919.

4 INVENTOH. 9 I WALL/1c: B. Mfl/iT/M' Pzitented Nov. 2,1920.

B H/s HTTORNEYS.

Uhll'lfil? STATES WALLACE B. MARTIN, OF ST. PAUL, MINNESOTA.

VALVE GRINDING AND BESEATING- TOOL.

mamas.

Application filed June 3, 1919.

To all whom it'mag concern:

Be it known that I, lVALLACE l3. MARTIN, a citizen of the United States, residing at St. Paul, in the county of Ramsey and State lVlinnesota, have invented certain new and useful Improvements in Valve Grinding and ltcseating Tools; and I do hereby declare the following to be a full, clear, and exact description ot the invention, such will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to valvegrinding and reseating tools, and is in the nature 01' an improvement on my United States Letters Patent, jl-l,286,378, issued of date December 3, 1918.

To the above end, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

in the accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings 1- Figure 1 is a fragmentary plan view of an internal combustion engine, the head of which is removed to expose the valves, and secured to the cylinder casting is the improved tool positioned to oscillate one of the valves;

Fig. 2 is a view principally in vertical -ection taken on the irregular line 22 of Fig. 1, on an enlarged scale; and

Fig. 3 is a detail view on an enlarged scale, with some parts sectioned on the line 3--3 of Fig. 1.

'lhe numeral l indicates the cylinder casting of an internal combustion engine, the head of which is removed to expose the valves 5 and valve seat 6. Bolts 7 one of which is shown in Fig. 2, are applicable for screw'threaded engagement with bores 8 in the engine casting 1 to detachably secure the cylinder head thereto. In grinding one of the valves 5, a coiled spring 9 is placed around the stern thereof between the valve head and the bottom of the valve chamber, and which spring is of such length as to lift the respective valve above its seat, as shown in Fig. 2. In the top of each valve 5 is a pair of diametrically opposite wrench pin holes 10.

The parts thus far described are of well known construction and have been illus- Specification of Letters Patent.

latented Nov.2, 1920.

Serial No. 301,532.

trated simply for the purpose or showing the invention applied in working position. lieierring now to the improved tool, the

To rigidly hold the bearing head '11.

against lateral swinging movement with its seat 12 in axial alinement with either one of the respective valve seats 6, there is provided an anchor pin 13. This anchor pin 13 is arranged to project through either one of two bores 14, formed in ears 15 on the longitudinal edge portions of the bearing head 11 and which bores are located equidistance on each side of a line that intersects the aXis of the bolt 7 and seat 12. It will be noted'that the anchor pin 13 is upwardly tapered and affords a support for the bearing head 11 to hold the same above a lock nut 16 on the bolt 7. The anchor pin 13 has a base 17, which rests directly on the top of the cylinder casting i, and is provided with a bore through which the bolt 7 loosely projects, and which base is held in different adjustments by the lock nut 16.

A tubular spindle 18 is mounted in the seat 12 for both rotary and endwiserhovcmerits, and has on its upper end a hand crank 19 secured thereto by a transversepin 20. Extending axially through the tubular spindle 18 is a stem 21, having on its lower end below said spindle a valve grapple 22 in the form of a fork, the prongs of which are arranged to enter the pin holes 10 in any one of the valves 5. The upper end or the stem 21 is expanded to afford a bearing head 23, through which the pin 20 extends and supports the valve grapple 22 for com: mon rotation with the tubular spindle 18, but with freedom for lateral wabble motion in respect thereto. The purpose of the grapple 22. It will be noted'that the upper end of the stem 21 projects above the tubular spindle 18 to afford a hand piece by Which the valve grapple 22 may be guided into the pin holes 10 of one of the valves 5.

The parts of the improved tool thus far described are fully described and broadly claimed in my heretofore mentioned patent.

To properly grind the valve, it is, of course, necessary to apply suflicient pressure to the hand crank 19 to overcome the spring 9 and carry the engaged valve 5 into the seat on which, together with the valve, is placed a valve grinding compound. It is also highly essential in grinding a valve to constantly release the pressure on the tool sufhciently to allow the spring 9 to lift the valve in order that the same may be given a slight rotation while out of engagement with its seat and then again pressed onto its seat. This constant applying of pressure to the tool and then releasing the same is very tiresome and also makes the work of grinding a valve rather slow.

The purpose of my present invention is provide means for automatically lifting tl valve grapple durin either the comp.

rotations or oscillations thereof without releasing the pressure on the hand crank 19, and thereby allow the spring 9 to lift the valve from its seat so that the same may be carried a short circumferential distance out of engagement with the seat, and then again brought into contact with said seat. 7

As one means for accomplishing this re sult, there is shown in the'accompanying drawings two circumferentially spaced lugs 24. integrally formed with the hub of the hand crankl9 and each of which. is provided on itslower face with oppositely extended cam surfaces 25 arranged to en a vertical abutment 26011 the bearing h V 11 in either direction of rotation of the hand crank 19. As shown, this abutment is in the form of a screw having round head with which th cams alternately engage when the hand crank 19' is given only partial rotation. This abutment 26 has screu threaded engagement with the bearing head 11 and is positively held in different set positions by a lock nut 27. Obviously, by vertically adjusting the abutment 26, the lift- 1 ,sezaoe ing movement imparted to the valve grap ple 22 by the engagement of the lugs 2 with said abutment, may be varied at will.

lVhilein the present drawings there is shown two cam lugs and one abutment,

it is of course understood that one or more.

1. A valve-grinding tool comprising a bearing head, a valve grapple rotatively mounted in said head with. freedom for lifting movement, means for rotating the valve grapple, cam lug, an abutment cooperating with the cam lug to lift the valve grapple and then release the same, and means for adjusting the abutment to vary the lift of'the valve grapple.

2. A valve-grinding tool comprising a support, a bearing head adjustably mounted on the support, a stem mounted in the bearing head with freedom for endwise and re tary movement, a valve grapple carried by the stem, a crank for rotating the stenrand imparting downward pressuie thereon, an abutment on the bearing head, and a cam surface on the crank arranged to intermittently engage the abutment to lift tie stem and then release the same.

3. A. valve-grinding tool comprising a support, a bearing head adjustably mounted on the support, a stem mounted in the bear- 7 ing head with freedom for endwise and rotary movement, a valve grapple carried by the stem, a crank for rotating the stem, and imparting downward pressure thereon, a vertically adjustableabutment on the bearing head, and a cam surface on the crank arranged to intermittently engage the abutment to lift the stem and then release the same.

In testimony whereof I. affix my signature in presence of two witnesses. VVALLACE B. MARTIN.

Witnesses CLARA DEMAREST,

VVINIFRED WARD. 

